残響室における壁体の音響透過損失測定の数値シミュレーション

DOI Web Site Web Site 参考文献12件
  • 會田 祐
    (株)長谷工コーポレーション技術研究所
  • 井上 尚久
    東京大学大学院新領域創成科学研究科社会文化環境学専攻
  • 佐久間 哲哉
    東京大学大学院新領域創成科学研究科社会文化環境学専攻

書誌事項

タイトル別名
  • NUMERICAL SIMULATION ON SOUND INSULATION MEASUREMENT OF WALLS IN REVERBERATION ROOM
  • 残響室における壁体の音響透過損失測定の数値シミュレーション : 複合部材の低音域共鳴透過に関する検討
  • ザンキョウシツ ニ オケル ヘキタイ ノ オンキョウ トウカ ソンシツ ソクテイ ノ スウチ シミュレーション : フクゴウ ブザイ ノ テイオンイキ キョウメイ トウカ ニ カンスル ケントウ
  • Study on low-frequency resonance transmission of composite members
  • 複合部材の低音域共鳴透過に関する検討

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抄録

<p> In the development of the sound insulation structures for buildings, evaluation of sound reduction index R is performed by laboratory measurement in accordance with JIS A 1416. Regarding multiple-layered structures with composite elements that are often used in building walls, assessment of low-frequency resonance transmission is crucial in the evaluation of their insulation performances. Implementation of numerical simulation on laboratory measurement of such complex structures is expected to contribute to improvement of efficiency in performance evaluation and to elucidation of sound transmission phenomena. The purpose of this paper is to simulate laboratory measurement of airborne sound insulation performances for composite members used in building walls by applying finite element method (FEM) and to validate the simulated results in low frequencies.</p><p> First, aiming to evaluate the wall structures for the separating walls in RC apartment buildings, measurement of sound reduction index R for an RC single wall and multiple-layered composite walls composed of RC panels and additional linings was performed in Type I reverberation room in accordance with JIS. Measurement of wall vibration due to acoustic excitation was also performed to observe the characteristics of the test walls.</p><p> Then, numerical simulation of the sound insulation measurement was performed using FE models where the entire sound fields of the source and receiving room were reproduced. The detailed structures of the test walls were modeled using elastic elements for the RC panels, the steel studs and the stud supports, along with plate elements for the gypsum boards. The material properties of the wall elements such as loss factor for the additional linings and Young’s modulus for the support material were identified experimentally. R was calculated for the frequency range of 50 to 315 Hz 1/3 octave bands.</p><p> The models of the RC single wall with several support conditions were investigated, and the analyzed results of R showed that some models succeeded in partially reproducing dips corresponding to the measurement, suggesting the possibility of simulating sound insulation performance for elastically-supported heavy-weight panels as targeted in this study.</p><p> The calculated results of R for the two composite walls exhibited that the models with limited simply-supported edges for the RC panels correspond to the general trends of the measured results in the frequency range above 100 Hz 1/3 octave band. Furthermore, the calculated results of sound reduction improvement index ΔR for the composite walls demonstrated the trend of decrease in value due to the decline of the degree of constraint in the RC panels, indicating the importance of the boundary condition of the basic wall in evaluating the influence of low-frequency resonance transmission by additional linings.</p><p> Although the simulation of the low frequency sound insulation for the composite members was validated within the scope of the experiment and the targeted frequency ranges, it is considered extremely important to obtain knowledges on modeling various measurement conditions through experimental and numerical investigations to improve the applicability of the simulation.</p>

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